They normally crack under the front where the rail moulding is bonded.
If your riding position is 'on the rivet', it might crack after a while, but if you sit a way back, sitbones on widest bit, etc... Should be fine.
This happened to mine actually. Sit bones didn't like the back or the saddle much. I just kept riding like an idiot and it snapped clean through the middle
They normally crack under the front where the rail moulding is bonded.
If your riding position is 'on the rivet', it might crack after a while, but if you sit a way back, sitbones on widest bit, etc... Should be fine.